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Effect of Drying Control Agent on Physicochemical and Thermal Properties of Silica Aerogel Derived via Ambient Pressure Drying Process

Author

Listed:
  • Natalia Pawlik

    (Institute of Chemistry, University of Silesia, 9 Szkolna Street, 40-007 Katowice, Poland)

  • Barbara Szpikowska-Sroka

    (Institute of Chemistry, University of Silesia, 9 Szkolna Street, 40-007 Katowice, Poland)

  • Artur Miros

    (Łukasiewicz Research Network—Warsaw Institute of Technology, Center for Sustainable Management of Raw Materials and Products, 193A Al. Korfantego Street, 40-157 Katowice, Poland)

  • Bronisław Psiuk

    (Łukasiewicz Research Network—Institute of Ceramics and Building Materials, Refractory Materials Division, 99 Toszecka Street, 44-100 Gliwice, Poland
    The “Edith Stein School with Character” Foundation, Bałtycka 8, 44-100 Gliwice, Poland)

  • Agnieszka Ślosarczyk

    (Institute of Building Engineering, Faculty of Civil and Transport Engineering, Poznan University of Technology, Piotrowo 3, 60-965 Poznan, Poland)

Abstract

This paper presents the effect of drying control agents on the physicochemical and thermal properties of hydrophobic silica aerogels derived via the ambient pressure drying (APD) method by a surface silylation using a TMCS/n-hexane mixture. The structural and physicochemical properties of synthesized DMF-modified and unmodified hydrophobic silica aerogels were characterized using Brunauer–Emmett–Teller (BET) analysis, thermo-gravimetric analysis, FT-IR, and Raman spectroscopic techniques. Based on the obtained results, the differences in structure between samples before and after a surface silylation and the effect of drying control agents were documented. The structural measurements confirmed the efficient silylation process (TMCS/n-hexane), as well as the presence of DMF residues of hydrogen bonded with unreacted Si-OH silanol groups within the silica backbone after surface modification. Based on TG analysis, it was found that DMF addition improves thermal resistance (up to 320 °C) and hydrophobic character of prepared aerogel. Modification of the silica aerogel synthesis process by DMF also resulted in a significant increase in BET—the specific surface area, for the unmodified aerogel was ~828 m 2 /g, and for the DMF-modified aerogel more than 1200 m 2 /g—much higher than the value of silica aerogels available on the market.

Suggested Citation

  • Natalia Pawlik & Barbara Szpikowska-Sroka & Artur Miros & Bronisław Psiuk & Agnieszka Ślosarczyk, 2023. "Effect of Drying Control Agent on Physicochemical and Thermal Properties of Silica Aerogel Derived via Ambient Pressure Drying Process," Energies, MDPI, vol. 16(17), pages 1-16, August.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:17:p:6244-:d:1227031
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    References listed on IDEAS

    as
    1. Ákos Lakatos, 2022. "Novel Thermal Insulation Materials for Buildings," Energies, MDPI, vol. 15(18), pages 1-4, September.
    2. Santu Golder & Ramadas Narayanan & Md. Rashed Hossain & Mohammad Rofiqul Islam, 2021. "Experimental and CFD Investigation on the Application for Aerogel Insulation in Buildings," Energies, MDPI, vol. 14(11), pages 1-16, June.
    3. Michalis Michael & Fabio Favoino & Qian Jin & Alessandra Luna-Navarro & Mauro Overend, 2023. "A Systematic Review and Classification of Glazing Technologies for Building Façades," Energies, MDPI, vol. 16(14), pages 1-47, July.
    4. Xinyang Wang & Yan Ding & Zhanwen Chen & Chuyan Tang & Xingyu Ren & Hongyun Hu & Qingyan Fang, 2022. "Measurement of the Kinetics and Thermodynamics of the Thermal Degradation for a Flame Retardant Polyurethane-Based Aerogel," Energies, MDPI, vol. 15(19), pages 1-16, September.
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